Optical isomer
An optical isomer refers to a case in which two molecules having optical activity form a mirror symmetric relationship. The original optical isomer may be confused with the so-called diastereomer, which has different optical properties, but is generally used synonymously with the enantiomer. Molecules with optical isomerism do not overlap with enantiomeric molecules through rotation and have stereogenic centers such as carbon or carbon, chemical bonds, nitrogen, and sulfur. In order to distinguish optical isomers from each other in terms of nomenclature, R / S designations are classified according to the Rank-Ingold-Prelog log sequence rule when four or more substituents are different, and D / L It is also distinguished by intelligence. Carbon, for example, has the potential of four bonds, all of which become chiral centers when all four are joined.